#include <iostream>
#include <vector>
using namespace std;

auto cmp = [](int a, int b) -> bool { return a < b;};

class App {
        class Info {
                int a, b;
        };

        Info a, b;
        //auto cmp = [](int a, int b) { return a < b;};
};

int main()
{
        int x, y;
        int &a = x;
        int &&b = x + 2;
        return 0;
}